Question

By the time Cynthia books the flight to Iceland, she _______ her sister about the visit.
-
has called
will has called
calls
will have called
called

Answer 1

Here is your answer user.

Calls is the answer because
this sentence is in present indefinite tense .
When sentence is in present tense then we look person in this sentence she is the third person singular number so it contain verb 1.
Plz marks me as brainlist.

Answer 2

called...............